D-Tetramannuronic acid

OC([C@@H](O[C@H]1O[C@@H]([C@@H]([C@@H]2O)O)[C@H](O[C@H]2O)C(O)=O)[C@H]([C@@H]([C@@H]1O)O)O[C@@H]([C@H]([C@H]3O)O)O[C@@H]([C@H]3O[C@@H]([C@H]([C@H]4O)O)O[C@@H]([C@H]4O)C(O)=O)C(O)=O)=O

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